diff --git a/examples/models/resources/shaders/glsl100/skinning.fs b/examples/models/resources/shaders/glsl100/skinning.fs
index ef6568036845..98a9e5badd58 100644
--- a/examples/models/resources/shaders/glsl100/skinning.fs
+++ b/examples/models/resources/shaders/glsl100/skinning.fs
@@ -1,17 +1,20 @@
 #version 100
 
-// Input vertex attributes (from vertex shader)
-in vec2 fragTexCoord;
-in vec4 fragColor;
+precision mediump float;
 
-// Output fragment color
-out vec4 finalColor;
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 colDiffuse;
 
 void main()
 {
+    // Fetch color from texture sampler
     vec4 texelColor = texture(texture0, fragTexCoord);
-    finalColor = texelColor*colDiffuse*fragColor;
+    
+    // Calculate final fragment color
+    gl_FragColor = texelColor*colDiffuse*fragColor;
 }
diff --git a/examples/models/resources/shaders/glsl100/skinning.vs b/examples/models/resources/shaders/glsl100/skinning.vs
index 9c92e2a8c8e2..456079102aff 100644
--- a/examples/models/resources/shaders/glsl100/skinning.vs
+++ b/examples/models/resources/shaders/glsl100/skinning.vs
@@ -1,18 +1,21 @@
 #version 100
 
-in vec3 vertexPosition;
-in vec2 vertexTexCoord;
-in vec4 vertexColor;
-in vec4 vertexBoneIds;
-in vec4 vertexBoneWeights;
+#define MAX_BONE_NUM 64
 
-#define MAX_BONE_NUM 128
-uniform mat4 boneMatrices[MAX_BONE_NUM];
+// Input vertex attributes
+attribute vec3 vertexPosition;
+attribute vec2 vertexTexCoord;
+attribute vec4 vertexColor;
+attribute vec4 vertexBoneIds;
+attribute vec4 vertexBoneWeights;
 
+// Input uniform values
 uniform mat4 mvp;
+uniform mat4 boneMatrices[MAX_BONE_NUM];
 
-out vec2 fragTexCoord;
-out vec4 fragColor;
+// Output vertex attributes (to fragment shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
 void main()
 {
@@ -22,13 +25,13 @@ void main()
     int boneIndex3 = int(vertexBoneIds.w);
     
     vec4 skinnedPosition =
-        vertexBoneWeights.x * (boneMatrices[boneIndex0] * vec4(vertexPosition, 1.0f)) +
-        vertexBoneWeights.y * (boneMatrices[boneIndex1] * vec4(vertexPosition, 1.0f)) + 
-        vertexBoneWeights.z * (boneMatrices[boneIndex2] * vec4(vertexPosition, 1.0f)) + 
-        vertexBoneWeights.w * (boneMatrices[boneIndex3] * vec4(vertexPosition, 1.0f));
+        vertexBoneWeights.x*(boneMatrices[boneIndex0]*vec4(vertexPosition, 1.0f)) +
+        vertexBoneWeights.y*(boneMatrices[boneIndex1]*vec4(vertexPosition, 1.0f)) + 
+        vertexBoneWeights.z*(boneMatrices[boneIndex2]*vec4(vertexPosition, 1.0f)) + 
+        vertexBoneWeights.w*(boneMatrices[boneIndex3]*vec4(vertexPosition, 1.0f));
     
     fragTexCoord = vertexTexCoord;
     fragColor = vertexColor;
 
-    gl_Position = mvp * skinnedPosition;
+    gl_Position = mvp*skinnedPosition;
 }
\ No newline at end of file