diff --git a/dlls/gdiplus/customlinecap.c b/dlls/gdiplus/customlinecap.c
index e8ad968de90..00c228bf3cf 100644
--- a/dlls/gdiplus/customlinecap.c
+++ b/dlls/gdiplus/customlinecap.c
@@ -157,6 +157,8 @@ GpStatus WINGDIPAPI GdipSetCustomLineCapStrokeCaps(GpCustomLineCap* custom,
 {
     static int calls;
 
+    TRACE("(%p,%u,%u)\n", custom, start, end);
+
     if(!custom)
         return InvalidParameter;
 
@@ -171,6 +173,8 @@ GpStatus WINGDIPAPI GdipSetCustomLineCapBaseCap(GpCustomLineCap* custom,
 {
     static int calls;
 
+    TRACE("(%p,%u)\n", custom, base);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -195,6 +199,8 @@ GpStatus WINGDIPAPI GdipSetCustomLineCapBaseInset(GpCustomLineCap* custom,
 {
     static int calls;
 
+    TRACE("(%p,%0.2f)\n", custom, inset);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -220,6 +226,8 @@ GpStatus WINGDIPAPI GdipSetCustomLineCapWidthScale(GpCustomLineCap* custom,
 {
     static int calls;
 
+    TRACE("(%p,%0.2f)\n", custom, width);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -243,6 +251,8 @@ GpStatus WINGDIPAPI GdipCreateAdjustableArrowCap(REAL height, REAL width, BOOL f
 {
     static int calls;
 
+    TRACE("(%0.2f,%0.2f,%i,%p)\n", height, width, fill, cap);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -253,6 +263,8 @@ GpStatus WINGDIPAPI GdipGetAdjustableArrowCapFillState(GpAdjustableArrowCap* cap
 {
     static int calls;
 
+    TRACE("(%p,%p)\n", cap, fill);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -263,6 +275,8 @@ GpStatus WINGDIPAPI GdipGetAdjustableArrowCapHeight(GpAdjustableArrowCap* cap, R
 {
     static int calls;
 
+    TRACE("(%p,%p)\n", cap, height);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -273,6 +287,8 @@ GpStatus WINGDIPAPI GdipGetAdjustableArrowCapMiddleInset(GpAdjustableArrowCap* c
 {
     static int calls;
 
+    TRACE("(%p,%p)\n", cap, middle);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -283,6 +299,8 @@ GpStatus WINGDIPAPI GdipGetAdjustableArrowCapWidth(GpAdjustableArrowCap* cap, RE
 {
     static int calls;
 
+    TRACE("(%p,%p)\n", cap, width);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -293,6 +311,8 @@ GpStatus WINGDIPAPI GdipSetAdjustableArrowCapFillState(GpAdjustableArrowCap* cap
 {
     static int calls;
 
+    TRACE("(%p,%i)\n", cap, fill);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -303,6 +323,8 @@ GpStatus WINGDIPAPI GdipSetAdjustableArrowCapHeight(GpAdjustableArrowCap* cap, R
 {
     static int calls;
 
+    TRACE("(%p,%0.2f)\n", cap, height);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -313,6 +335,8 @@ GpStatus WINGDIPAPI GdipSetAdjustableArrowCapMiddleInset(GpAdjustableArrowCap* c
 {
     static int calls;
 
+    TRACE("(%p,%0.2f)\n", cap, middle);
+
     if(!(calls++))
         FIXME("not implemented\n");
 
@@ -323,6 +347,8 @@ GpStatus WINGDIPAPI GdipSetAdjustableArrowCapWidth(GpAdjustableArrowCap* cap, RE
 {
     static int calls;
 
+    TRACE("(%p,%0.2f)\n", cap, width);
+
     if(!(calls++))
         FIXME("not implemented\n");