diff --git a/plugins/GSdx/res/glsl_source.h b/plugins/GSdx/res/glsl_source.h
index aa107b327a..5af90bbf49 100644
--- a/plugins/GSdx/res/glsl_source.h
+++ b/plugins/GSdx/res/glsl_source.h
@@ -419,7 +419,7 @@ static const char* shadeboost_glsl =
 	"	const float brt = SB_BRIGHTNESS / 50.0;\n"
 	"	const float con = SB_CONTRAST / 50.0;\n"
 	"	\n"
-	"	// Increase or decrease these values to adjust r, g and b color channels seperately\n"
+	"	// Increase or decrease these values to adjust r, g and b color channels separately\n"
 	"	const float AvgLumR = 0.5;\n"
 	"	const float AvgLumG = 0.5;\n"
 	"	const float AvgLumB = 0.5;\n"
diff --git a/plugins/GSdx/res/shadeboost.fx b/plugins/GSdx/res/shadeboost.fx
index 375e032e58..8a30067440 100644
--- a/plugins/GSdx/res/shadeboost.fx
+++ b/plugins/GSdx/res/shadeboost.fx
@@ -13,7 +13,7 @@ float4 ContrastSaturationBrightness(float4 color) // Ported to HLSL
 	const float brt = SB_BRIGHTNESS / 50.0;
 	const float con = SB_CONTRAST / 50.0;
 	
-	// Increase or decrease these values to adjust r, g and b color channels seperately
+	// Increase or decrease these values to adjust r, g and b color channels separately
 	const float AvgLumR = 0.5;
 	const float AvgLumG = 0.5;
 	const float AvgLumB = 0.5;
diff --git a/plugins/GSdx/res/shadeboost.glsl b/plugins/GSdx/res/shadeboost.glsl
index 8ac44c893d..b3456bdf76 100644
--- a/plugins/GSdx/res/shadeboost.glsl
+++ b/plugins/GSdx/res/shadeboost.glsl
@@ -43,7 +43,7 @@ vec4 ContrastSaturationBrightness(vec4 color)
 	const float brt = SB_BRIGHTNESS / 50.0;
 	const float con = SB_CONTRAST / 50.0;
 	
-	// Increase or decrease these values to adjust r, g and b color channels seperately
+	// Increase or decrease these values to adjust r, g and b color channels separately
 	const float AvgLumR = 0.5;
 	const float AvgLumG = 0.5;
 	const float AvgLumB = 0.5;
diff --git a/plugins/PeopsSPU2/adsr.c b/plugins/PeopsSPU2/adsr.c
index 0413b264c9..0ab5c02a28 100644
--- a/plugins/PeopsSPU2/adsr.c
+++ b/plugins/PeopsSPU2/adsr.c
@@ -268,7 +268,7 @@ Rr = Release rate is the rate at which the volume of the note decreases
                                   ->time
 
 The overal volume can also be set to sweep up or down lineairly or
-exponentially from it's current value. This can be done seperately
+exponentially from it's current value. This can be done separately
 for left and right.
 
 Relevant SPU registers: