diff --git a/examples/fragment.glsl b/examples/fragment.glsl
index f036433..477c4e3 100644
--- a/examples/fragment.glsl
+++ b/examples/fragment.glsl
@@ -68,7 +68,7 @@ float limit(float val, float min, float max) {
 }
 
 void mainImage(out vec4 fragColor, in vec2 fragCoord) {
-    vec2 screen_uv = gl_FragCoord.xy / iResolution;
+    vec2 screen_uv = gl_FragCoord.xy / iResolution.xy;
     // We'll make origin in the top-left.
     screen_uv.y = 1.0 - screen_uv.y;
     screen_uv.x *= iResolution.x / iResolution.y;
diff --git a/examples/texture.glsl b/examples/texture.glsl
index 9df71b0..52e6823 100644
--- a/examples/texture.glsl
+++ b/examples/texture.glsl
@@ -1,5 +1,5 @@
 void mainImage(out vec4 fragColor, in vec2 fragCoord) {
-    vec2 uv = fragCoord / iResolution;
+    vec2 uv = fragCoord / iResolution.xy;
     uv = vec2(uv.x, 1.0 - uv.y);
     // mixes two textures
     //fragColor = mix(texture(iChannel0, uv), texture(iChannel1, uv), 0.2);
diff --git a/examples/wavy.glsl b/examples/wavy.glsl
index af67ee9..1f4d811 100644
--- a/examples/wavy.glsl
+++ b/examples/wavy.glsl
@@ -1,7 +1,7 @@
 #define PI 3.1415926538
 
 void mainImage(out vec4 fragColor, in vec2 fragCoord) {
-    vec2 uv = fragCoord / iResolution;
+    vec2 uv = fragCoord / iResolution.xy;
 
     vec2 lines_uv = uv;
 
diff --git a/glonkers.1 b/glonkers.1
index 061f9a6..4aaf23c 100644
--- a/glonkers.1
+++ b/glonkers.1
@@ -47,9 +47,9 @@ Time since program start.
 .RE
 
 .PP
-\fBiResolution\fR : vec2
+\fBiResolution\fR : vec3
 .RS 4
-Resolution in (number of pixels) x & y.
+Resolution in number of pixels. x: width, y: height, z: aspect-ratio (hard coded to 1.0).
 .RE
 
 .PP
@@ -59,11 +59,18 @@ The currently rendered frame.
 .RE
 
 .PP
-\fBiChannel\fR{\fB0\fR..\fB3\fR} : int
+\fBiChannel\fR{\fB0\fR..\fB3\fR} : sampler
 .RS 4
 Samplers for provided textures.
 .RE
 
+.PP
+\fBiChannelResolution\fR : vec3[4]
+.RS 4
+Array of resolutions for iChannel:s. x: width, y: height, z: aspect-ratio (hard coded
+to 1.0).
+.RE
+
 .SH SEE ALSO
 \fBwlr-randr\fR(1)
 .PP
diff --git a/renderer.c b/renderer.c
index e2061ee..1a31aa4 100644
--- a/renderer.c
+++ b/renderer.c
@@ -45,7 +45,7 @@ const char *fragment_header_src =
 "precision lowp sampler2D;\n"
 "precision lowp samplerCube;\n"
 "layout(location = 0) out vec4 color;\n"
-"uniform vec2 iResolution;\n"
+"uniform vec3 iResolution;\n"
 "uniform float iTime;\n"
 "uniform int iFrame;\n"
 "uniform sampler2D iChannel0;\n"
@@ -266,7 +266,7 @@ void render(Renderer *state, int w, int h, double time, char *shader_path, int r
     glUniform3fv(uniform_iChannelResolution, state->texture_count, iChannelResolutions);
 
     int uniform_iResolution = glGetUniformLocation(state->shader, "iResolution");
-    glUniform2f(uniform_iResolution, w, h);
+    glUniform3f(uniform_iResolution, w, h, 1.0);
 
     int uniform_iTime = glGetUniformLocation(state->shader, "iTime");
     glUniform1f(uniform_iTime, (float)time);