diff --git a/SOL002/README.md b/SOL002/README.md
index f5f7677f55fcf78e1846a4ff3f61fb4cdef215c3..6bc458b0a3adba662eaef1bb745f8f3a408c1fe5 100644
--- a/SOL002/README.md
+++ b/SOL002/README.md
@@ -1,7 +1,9 @@
 # NFV API Tests
 
 This is a development folder for ETSI STF 557.
-It includes the NFV API conformance test descriptions.
+It includes the NFV API conformance test descriptions for NFV SOL002 APIs.
+
+The reference spec version is v2.4.1: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/002/02.04.01_60/gs_NFV-SOL002v020401p.pdf
 
 ## License
 
diff --git a/SOL002/gs_NFV-SOL002v020401p.pdf b/SOL002/gs_NFV-SOL002v020401p.pdf
deleted file mode 100644
index 5cdf56a81964dad1c293b7902f85e3c7156f20a4..0000000000000000000000000000000000000000
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diff --git a/SOL003/README.md b/SOL003/README.md
index f5f7677f55fcf78e1846a4ff3f61fb4cdef215c3..d8535969054f70712e788013df1cc2b25c08be16 100644
--- a/SOL003/README.md
+++ b/SOL003/README.md
@@ -1,7 +1,9 @@
 # NFV API Tests
 
 This is a development folder for ETSI STF 557.
-It includes the NFV API conformance test descriptions.
+It includes the NFV API conformance test descriptions for NFV SOL003 APIs.
+
+The reference spec version is v2.4.1: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/003/02.04.01_60/gs_nfv-sol003v020401p.pdf
 
 ## License
 
diff --git a/SOL003/gs_nfv-sol003v020401p.pdf b/SOL003/gs_nfv-sol003v020401p.pdf
deleted file mode 100644
index 280e3f37e5e3c1cd3481a5aa6773e7d3c52eea9d..0000000000000000000000000000000000000000
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diff --git a/SOL005/README.md b/SOL005/README.md
index f5f7677f55fcf78e1846a4ff3f61fb4cdef215c3..5925a2468cb40bbc76f8a8a38254297995ebef6f 100644
--- a/SOL005/README.md
+++ b/SOL005/README.md
@@ -1,7 +1,9 @@
 # NFV API Tests
 
 This is a development folder for ETSI STF 557.
-It includes the NFV API conformance test descriptions.
+It includes the NFV API conformance test descriptions for NFV SOL005 APIs.
+
+The reference spec version is v2.4.1: https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/005/02.04.01_60/gs_NFV-SOL005v020401p.pdf<
 
 ## License
 
diff --git a/SOL005/gs_NFV-SOL005v020401p.pdf b/SOL005/gs_NFV-SOL005v020401p.pdf
deleted file mode 100644
index 25853e74037202158cee668abf38a751c7613b91..0000000000000000000000000000000000000000
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