diff --git a/categories-and-types/README.md b/categories-and-types/README.md
index a58deac..6ccbc62 100644
--- a/categories-and-types/README.md
+++ b/categories-and-types/README.md
@@ -156,6 +156,7 @@
 |target-machine| | | | | | |
 |target-org| | | | | | |
 |target-user| | | | | | |
+|telfhash| | X | | | | |
 |text| X | X | X | X | X | X |
 |threat-actor| | | X | | | |
 |tlsh| | | | | | |
@@ -338,6 +339,7 @@
 |target-machine| | | | | | |
 |target-org| | | | | | |
 |target-user| | | | | | |
+|telfhash| | | X | X | | |
 |text| X | X | X | X | X | X |
 |threat-actor| | | | | | |
 |tlsh| | | X | X | | |
@@ -520,6 +522,7 @@
 |target-machine| | | | X |
 |target-org| | | | X |
 |target-user| | | | X |
+|telfhash| | | | |
 |text| X | X | X | |
 |threat-actor| | | | |
 |tlsh| | | | |
@@ -722,6 +725,7 @@
 *   **target-machine**: Attack Targets Machine Name(s)
 *   **target-org**: Attack Targets Department or Organization(s)
 *   **target-user**: Attack Targets Username(s)
+*   **telfhash**: telfhash is symbol hash for ELF files, just like imphash is imports hash for PE files.
 *   **text**: Name, ID or a reference
 *   **threat-actor**: A string identifying the threat actor
 *   **tlsh**: A checksum in the Trend Micro Locality Sensitive Hash format