diff --git a/.gitignore b/.gitignore
index ad00ef6..45d1b69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 SOURCES/slf4j-1.7.25.tar.gz
+/slf4j-1.7.25.tar.gz
diff --git a/.slf4j.metadata b/.slf4j.metadata
new file mode 100644
index 0000000..2aafbc3
--- /dev/null
+++ b/.slf4j.metadata
@@ -0,0 +1 @@
+f564e3825b62172e81874ec73fafcc2747fb3d3b slf4j-1.7.25.tar.gz
diff --git a/sources b/sources
index 3024607..8d60493 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA1 (slf4j-1.7.25.tar.gz) = f564e3825b62172e81874ec73fafcc2747fb3d3b
+SHA512 (slf4j-1.7.25.tar.gz) = 4f6a02ff542b1e8333d06d94d0dd604f6101b67e73bc348c224c26b0f503ac5a6cb14711526a659e3670bd724b65a0d9165aff926e10090b8ef60f34767bbce5