diff --git a/src/joystick/android/SDL_sysjoystick.c b/src/joystick/android/SDL_sysjoystick.c
index 3d82fcb5b..bd67d5e6d 100644
--- a/src/joystick/android/SDL_sysjoystick.c
+++ b/src/joystick/android/SDL_sysjoystick.c
@@ -495,7 +495,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
     return (0);
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return joystick->hwdata != NULL;
diff --git a/src/joystick/bsd/SDL_sysjoystick.c b/src/joystick/bsd/SDL_sysjoystick.c
index efbd79c59..f0d356256 100644
--- a/src/joystick/bsd/SDL_sysjoystick.c
+++ b/src/joystick/bsd/SDL_sysjoystick.c
@@ -421,7 +421,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joy, int device_index)
     return (-1);
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return SDL_TRUE;
diff --git a/src/joystick/dummy/SDL_sysjoystick.c b/src/joystick/dummy/SDL_sysjoystick.c
index a046e0e5f..1cf2e28ce 100644
--- a/src/joystick/dummy/SDL_sysjoystick.c
+++ b/src/joystick/dummy/SDL_sysjoystick.c
@@ -71,7 +71,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
     return SDL_SetError("Logic error: No joysticks available");
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return SDL_TRUE;
diff --git a/src/joystick/emscripten/SDL_sysjoystick.c b/src/joystick/emscripten/SDL_sysjoystick.c
index 5d8e91572..3eb50e2a2 100644
--- a/src/joystick/emscripten/SDL_sysjoystick.c
+++ b/src/joystick/emscripten/SDL_sysjoystick.c
@@ -323,7 +323,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
     return (0);
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return joystick->hwdata != NULL;
diff --git a/src/joystick/haiku/SDL_haikujoystick.cc b/src/joystick/haiku/SDL_haikujoystick.cc
index c9b7e114a..20630c4e2 100644
--- a/src/joystick/haiku/SDL_haikujoystick.cc
+++ b/src/joystick/haiku/SDL_haikujoystick.cc
@@ -152,7 +152,7 @@ extern "C"
         return (0);
     }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
     SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
     {
         return SDL_TRUE;
diff --git a/src/joystick/iphoneos/SDL_sysjoystick.m b/src/joystick/iphoneos/SDL_sysjoystick.m
index 25bdfbbf3..d3506b752 100644
--- a/src/joystick/iphoneos/SDL_sysjoystick.m
+++ b/src/joystick/iphoneos/SDL_sysjoystick.m
@@ -102,7 +102,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
     return 0;
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return SDL_TRUE;
diff --git a/src/joystick/linux/SDL_sysjoystick.c b/src/joystick/linux/SDL_sysjoystick.c
index 7dd33efd0..a36593077 100644
--- a/src/joystick/linux/SDL_sysjoystick.c
+++ b/src/joystick/linux/SDL_sysjoystick.c
@@ -621,7 +621,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
     return (0);
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return joystick->hwdata->item != NULL;
diff --git a/src/joystick/psp/SDL_sysjoystick.c b/src/joystick/psp/SDL_sysjoystick.c
index 41f9358fc..207d4fbf1 100644
--- a/src/joystick/psp/SDL_sysjoystick.c
+++ b/src/joystick/psp/SDL_sysjoystick.c
@@ -177,7 +177,7 @@ int SDL_SYS_JoystickOpen(SDL_Joystick *joystick, int device_index)
     return 0;
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return SDL_TRUE;
diff --git a/src/joystick/windows/SDL_mmjoystick.c b/src/joystick/windows/SDL_mmjoystick.c
index 6c02597a9..3ed6892d0 100644
--- a/src/joystick/windows/SDL_mmjoystick.c
+++ b/src/joystick/windows/SDL_mmjoystick.c
@@ -271,7 +271,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
     return (0);
 }
 
-/* Function to determine is this joystick is attached to the system right now */
+/* Function to determine if this joystick is attached to the system right now */
 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
 {
     return SDL_TRUE;