diff --git a/vlib/compress/deflate/deflate.v b/vlib/compress/deflate/deflate.v
index e4d399a411..29d5f6e66b 100644
--- a/vlib/compress/deflate/deflate.v
+++ b/vlib/compress/deflate/deflate.v
@@ -3,13 +3,13 @@ module deflate
 import compress as compr
 
 // compresses an array of bytes using deflate and returns the compressed bytes in a new array
-// Example: compressed := deflate.compress(b)!
+// Example: b := 'abcabc'.repeat(100).bytes(); compressed := deflate.compress(b)!; dump(compressed); assert compressed.len == 163
 pub fn compress(data []u8) ![]u8 {
 	return compr.compress(data, 0)
 }
 
 // decompresses an array of bytes using deflate and returns the decompressed bytes in a new array
-// Example: decompressed := deflate.decompress(b)!
+// Example: b := 'abcabc'.repeat(100).bytes(); compressed := deflate.compress(b)!; decompressed := deflate.decompress(compressed)!; assert b == decompressed
 pub fn decompress(data []u8) ![]u8 {
 	return compr.decompress(data, 0)
 }
diff --git a/vlib/compress/gzip/gzip.v b/vlib/compress/gzip/gzip.v
index ac35811ac4..55db06b0b5 100644
--- a/vlib/compress/gzip/gzip.v
+++ b/vlib/compress/gzip/gzip.v
@@ -55,7 +55,7 @@ pub:
 }
 
 // compresses an array of bytes using gzip and returns the compressed bytes in a new array
-// Example: compressed := gzip.compress(b, compression_level:4095)!
+// Example: b := 'abcde'.repeat(1000).bytes(); cmprsd := gzip.compress(b, compression_level:4095)!; assert cmprsd.len == 47
 // Note: compression_level 0~4095
 pub fn compress(data []u8, params CompressParams) ![]u8 {
 	if params.compression_level !in 0..4096 {
@@ -204,7 +204,7 @@ pub fn validate(data []u8, params DecompressParams) !GzipHeader {
 }
 
 // decompress an array of bytes using zlib and returns the decompressed bytes in a new array.
-// Example: decompressed := gzip.decompress(b)!
+// Example: b := 'abcdef'.repeat(1000).bytes(); cmpr := gzip.compress(b)!; decmpr := gzip.decompress(cmpr)!; assert cmpr.len < b.len; assert b == decmpr
 pub fn decompress(data []u8, params DecompressParams) ![]u8 {
 	gzip_header := validate(data, params)!
 	header_length := gzip_header.length
diff --git a/vlib/compress/zlib/zlib.v b/vlib/compress/zlib/zlib.v
index 3d6f026530..dc1bada946 100644
--- a/vlib/compress/zlib/zlib.v
+++ b/vlib/compress/zlib/zlib.v
@@ -3,14 +3,14 @@ module zlib
 import compress as compr
 
 // compresses an array of bytes using zlib and returns the compressed bytes in a new array
-// Example: compressed := zlib.compress(b)!
+// Example: b := 'abcdefgh'.repeat(1000).bytes(); cmpr := zlib.compress(b)!; assert cmpr.len < b.len; dc := zlib.decompress(cmpr)!; assert b == dc
 pub fn compress(data []u8) ![]u8 {
 	// flags = TDEFL_WRITE_ZLIB_HEADER (0x01000)
 	return compr.compress(data, 0x01000)
 }
 
 // decompresses an array of bytes using zlib and returns the decompressed bytes in a new array
-// Example: decompressed := zlib.decompress(b)!
+// Example: b := 'abcdefgh'.repeat(1000).bytes(); cmpr := zlib.compress(b)!; assert cmpr.len < b.len; dc := zlib.decompress(cmpr)!; assert b == dc
 pub fn decompress(data []u8) ![]u8 {
 	// flags = TINFL_FLAG_PARSE_ZLIB_HEADER (0x1)
 	return compr.decompress(data, 0x1)
diff --git a/vlib/compress/zstd/zstd.c.v b/vlib/compress/zstd/zstd.c.v
index abefa3bc1e..915e38b4e5 100644
--- a/vlib/compress/zstd/zstd.c.v
+++ b/vlib/compress/zstd/zstd.c.v
@@ -415,7 +415,7 @@ pub:
 
 // compresses an array of bytes using zstd and returns the compressed bytes in a new array
 // extra compression parameters can be set by `params`
-// Example: compressed := zstd.compress(b)!
+// Example: b := 'abcdef'.repeat(1000).bytes(); cmpr := zstd.compress(b, compression_level: 10)!; assert cmpr.len < b.len; dc := zstd.decompress(cmpr)!; assert b == dc
 pub fn compress(data []u8, params CompressParams) ![]u8 {
 	dst_capacity := C.ZSTD_compressBound(data.len)
 	check_error(dst_capacity)!
@@ -437,7 +437,7 @@ pub:
 
 // decompresses an array of bytes using zstd and returns the decompressed bytes in a new array
 // extra decompression parameters can be set by `params`
-// Example: decompressed := zstd.decompress(b)!
+// Example: b := 'abcdef'.repeat(1000).bytes(); cmpr := zstd.compress(b, compression_level: 10)!; assert cmpr.len < b.len; dc := zstd.decompress(cmpr)!; assert b == dc
 pub fn decompress(data []u8, params DecompressParams) ![]u8 {
 	dst_capacity := C.ZSTD_getFrameContentSize(data.data, frame_header_size_max)
 	if dst_capacity == content_size_unknown {